Put the flour in a large mixing bowl and create a well in the middle using a small bowl.
Add the sugar, active dry yeast, lukewarm milk, and lukewarm water to the well. Use a fork to scrape off some of the flour from the edge of the bowl and mix it with the wet ingredients. Let the dough rise for about 15 minutes.
Now add the eggs, salt, and vegetable oil to the dough in the bowl and mix everything with a hand mixer (with a dough hook) until a smooth and supple dough starts to form. Allow the dough to rise in a warm place for about 2 hours.
Divide the risen dough into two pieces of about 26 oz each. Set the rest of the dough aside for now.
Melt the butter, add the brown sugar and cinnamon, and mix well. Roll out both pieces of dough lengthwise and spread the cinnamon-sugar mixture over them.
Roll the dough up tightly and form a spiral. Do the same thing with the second piece of dough.
Line a springform pan with parchment paper so that it stands up straight in the pan.
Preheat the oven to 350°F. Stack the cinnamon rolls in the springform pan and let the dough rise for another 20-30 minutes. Then brush the dough with milk and bake for 50 minutes.
Meanwhile, use the remaining dough to prepare the mini cinnamon rolls. Roll out the dough, brush it with the cinnamon filling, and roll it into a spiral. Cut the spiral into slices, place them on a sheet pan lined with parchment paper, and bake for about 8 minutes at 400°F. Once the cinnamon roll cake and mini cinnamon rolls have cooled, coat the lower part of the cake and the upper spiral with whipped cream and line the bottom with mini cinnamon rolls.